EPOLL_CREATE(3C) Standard C Library Functions EPOLL_CREATE(3C)

NAME

epoll_create, epoll_create1 - create an epoll instance

SYNOPSIS

#include <sys/epoll.h>

int epoll_create(int size);


int epoll_create1(int flags);

DESCRIPTION

The epoll_create() and epoll_create1() functions both create an
epoll(7) instance that can be operated upon via epoll_ctl(3C),
epoll_wait(3C) and epoll_pwait(3C). epoll instances are represented
as file descriptors, and should be closed via close(2).

The only difference between the two functions is their signature;
epoll_create() takes a size argument that is vestigial and is only
meaningful in as much as it must be greater than zero, while
epoll_create1() takes a flags argument that can have any of the
following values:


EPOLL_CLOEXEC
Instance should be closed upon an exec(2); see open(2)'s
description of O_CLOEXEC.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned
and errno is set to indicate the error.

ERRORS

The epoll_create() and epoll_create1() functions will fail if:

EINVAL
Either the size is zero (epoll_create()) or the flags are
invalid (epoll_create1()).


EMFILE
There are currently {OPEN_MAX} file descriptors open in the
calling process.


ENFILE
The maximum allowable number of files is currently open in
the system.

NOTES

The epoll(7) facility is implemented for purposes of offering
compatibility for Linux-borne applications; native applications
should continue to prefer using event ports via the port_create(3C),
port_associate(3C) and port_get(3C) interfaces. See epoll(7) for
compatibility details and restrictions.

SEE ALSO

epoll_ctl(3C), epoll_wait(3C), epoll(7)

February 17, 2023 EPOLL_CREATE(3C)